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To download video - Copy the page URL with liked video. Then paste the URL into the box and press "Download" button. And then click on the format with quality you want, to save the video wherever you want it.

Currently video can be saved in format: mp4 (original, 4k, HD, 1080p quality, 720p, mobile), webm, flv, mov, 3gp (mobile) - depends on the video hosting/site from which you want to download the video file of your favorite video, and depends on which video format the video had when it was uploaded to a video hosting/site initially.
The video quality depends on original format of the streaming video file which hosted on a third-party server of a video hosting/site. Download speed depends on the length of the video file you are saving and on your internet connection.